The Singapore citizenship is desired by most of the immigrants and expatriates around the world being the loving reasons such as stable government, corruption free system, easy access to Members of Parliament (MPs), strong economy, always maintaining with surplus budget, safe heaven, multi-racial society, subsidised great educational systems, persistent encouragement for lifelong learning, owning home ownership at 91.50% where more than 80% living in HDB flats, subsidised health care systems, tropical / equatorial climate without worries to gear up with earmuffs and windbreakers, easy accessible wheel-chair enabled public transport till past midnight, easy communications in English as the common language, low to high end shopping malls, world brand boutiques like Apple, late night shopping, plenty of outdoor activities, many grassroots organisations (GROs), very cleanliness, wide-spread public libraries, most powerful passport for availing visa freeness or on-arrival visa, etc.
After living in Singapore as Permanent Residents (preferably by contributing to both economy and community) you are eligible to apply for Singapore citizenship which is subject to very stringent criteria set by the Government of Singapore.
Singapore is a single citizenship country and this is strictly enforced. For this reason, Singapore may not be attractive if anyone is interested in holding more than one citizenship and passport.